EP125：垃圾回收机制的工作原理是什么？_AI阅读总结 — 包阅AI

This week’s system design refresher:

• Linux Performance Tools! (Youtube video)

• How does Garbage Collection work?

• A Cheat Sheet for Designing Fault-Tolerant Systems

• 10 System Design Tradeoffs You Cannot Ignore

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Garbage collection is an automatic memory management feature used in programming languages to reclaim memory no longer used by the program.

• Java
  Java provides several garbage collectors, each suited for different use cases:
  
  1. Serial Garbage Collector: Best for single-threaded environments or small applications.
  
  2. Parallel Garbage Collector: Also known as the “Throughput Collector.”
  
  3. CMS (Concurrent Mark-Sweep) Garbage Collector: Low-latency collector aiming to minimize pause times.
  
  4. G1 (Garbage-First) Garbage Collector: Aims to balance throughput and latency.
  
  5. Z Garbage Collector (ZGC): A low-latency garbage collector designed for applications that require large heap sizes and minimal pause times.

• Python
  Python’s garbage collection is based on reference counting and a cyclic garbage collector:
  
  1. Reference Counting: Each object has a reference count; when it reaches zero, the memory is freed.
  
  2. Cyclic Garbage Collector: Handles circular references that can’t be resolved by reference counting.

• GoLang
  Concurrent Mark-and-Sweep Garbage Collector: Go’s garbage collector operates concurrently with the application, minimizing stop-the-world pauses.

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Designing fault-tolerant systems is crucial for ensuring high availability and reliability in various applications. Here are six top principles of designing fault-tolerant systems:

1. Replication
   Replication involves creating multiple copies of data or services across different nodes or locations.

2. Redundancy
   Redundancy refers to having additional components or systems that can take over in case of a failure.

3. Load Balancing
   Load balancing distributes incoming network traffic across multiple servers to ensure no single server becomes a point of failure.

4. Failover Mechanisms
   Failover mechanisms automatically switch to a standby system or component when the primary one fails.

5. Graceful Degradation
   Graceful degradation ensures that a system continues to operate at reduced functionality rather than completely failing when some components fail.

6. Monitoring and Alerting
   Continuously monitor the system’s health and performance, and set up alerts for any anomalies or failures.

If you don’t know trade-offs, you DON’T KNOW system design.

1. Vertical vs Horizontal Scaling
   Vertical scaling is adding more resources (CPU, RAM) to an existing server.

   Horizontal scaling means adding more servers to the pool.

2. SQL vs NoSQL
   SQL databases organize data into tables of rows and columns.

   NoSQL is ideal for applications that need a flexible schema.

3. Batch vs Stream Processing
   Batch processing involves collecting data and processing it all at once. For example, daily billing processes.

   Stream processing processes data in real time. For example, fraud detection processes.

4. Normalization vs Denormalization
   Normalization splits data into related tables to ensure that each piece of information is stored only once.

   Denormalization combines data into fewer tables for better query performance.

5. Consistency vs Availability
   Consistency is the assurance of getting the most recent data every single time.

   Availability is about ensuring that the system is always up and running, even if some parts are having problems.

6. Strong vs Eventual Consistency
   Strong consistency is when data updates are immediately reflected.

   Eventual consistency is when data updates are delayed before being available across nodes.

7. REST vs GraphQL
   With REST endpoints, you gather data by accessing multiple endpoints.

   With GraphQL, you get more efficient data fetching with specific queries but the design cost is higher.

8. Stateful vs Stateless
   A stateful system remembers past interactions.

   A stateless system does not keep track of past interactions.

9. Read-Through vs Write-Through Cache
   A read-through cache loads data from the database in case of a cache miss.

   A write-through cache simultaneously writes data updates to the cache and storage.

10. Sync vs Async Processing
    In synchronous processing, tasks are performed one after another.

    In asynchronous processing, tasks can run in the background. New tasks can be started without waiting for a new task.

Over to you: Which other tradeoffs have you encountered?

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